E-Journal Politeknik Negeri Cilacap
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Analisa Beban Penekanan Hidrolis Terhadap Kekerasan Komposit Resin Epoksi Berpenguat Serbuk Kulit Jagung dan Fly Ash Menggunakan Metode Compression Molding
Get PDFUsing fly ash and natural fibers as environmentally friendly composite materials is expected to reduce the negative impact of fly ash as industrial waste, turning it into a material with added value. One of the methods in composite manufacturing is the compression molding method. This research aims to analyze the influence of compaction loading variations on the hardness values of epoxy composites reinforced with corn husk-fly ash powder. The research begins with producing composite specimens containing corn husk powder (20% wt) and fly ash (10% wt). The specimens are pressed with compaction loading variations of 1 ton, 2 tons, 3 tons, and 4 tons. The specimens from the compression molding are then subjected to sintering treatment at 150°C for 1 hour, followed by Shore D hardness testing. The results show that the composite material\u27s hardness increases with the compaction loading. The highest hardness is achieved at a compaction load of 4 tons with a hardness value of 80.3 SHD. The compaction process of the composite material produces a fly ash structure that undergoes agglomeration or structural densification. This phenomenon results in an increase in the hardness of the material along with an increase in the compaction loading.Penggunaan fly ash dan serat alam sebagai bahan komposit ramah lingkungan diharapkan mampu mengurangi dampak negatif fly ash sebagai limbah industri sehingga menjadi bahan yang memiliki nilai tambah. Salah satu metode dalam pembuatan komposit yakni metode compression molding. Tujuan dari penelitian untuk menganalisis pengaruh variasi pembebanan kompaksi pada nilai kekerasan komposit epoksi berpenguat serbuk kulit jagung-fly ash. Proses penelitian diawali dengan pembuatan spesimen komposit serbuk kulit jagung (20% wt) dan fly ash (10% wt). Spesimen ditekan dengan variasi pembebanan 1 ton, 2 ton, 3 ton, dan 4 ton. Spesimen hasil compression molding selanjutnya diberi perlakuan sintering pada suhu 150 0C selama 1 jam dan kemudian dilakukan uji kekerasan Shore D. Hasil menunjukkan bahwasanya kekerasan material komposit semakin meningkat seiring dengan meningkatnya beban penekanan. Kekerasan tertinggi dicapai pada beban penekanan 4 ton dengan nilai kekerasan 80,3 SHD. Proses penekanan/kompaksi material komposit menghasilkan struktur fly ash yang mengalami fenomena aglomerasi atau proses pemadatan struktur. Fenomena inilah yang mengakibatkan terjadinya peningkatan kekerasan material seiring dengan peningkatan beban penekanan kompaksi
Pembelajaran Ensemble untuk Klasifikasi Ulasan Pelanggan E-commerce Menggunakan Teknik Boosting
Get PDFTechnological developments have developed rapidly and impact changing behavior in daily activities. Now, selling and buying activities are carried out in e-commerce services. The increase in e-commerce users is the main factor in improving the quality of e-commerce services. One of the factors to improve the quality of e-commerce services is customer reviews. Customer reviews are useful for shop owners to find out whether the product offered has positive or negative reviews. The large number of customer reviews is the main factor in the difficulty of shop owners in classifying customer reviews. This study proposes classifying customer reviews using ensemble learning with boosting techniques such as XGBoost, AdaBoost, Gradient Boosting, and LightGBM. The use of an ensemble with a boosting technique aims to improve the algorithm’s performance. In a test scenario apply majority voting to produce the best performance from each algorithm. The result shows that the XGBoost algorithm produces higher accuracy than other techniques are 92.30%. On the analysis of matric evaluation of precision, recall, and F1-Score, XGBoost produces higher true positive values than other techniques such as AdaBoost, Gradient Boosting, and Light GB
Produksi Biofuel Berbahan Baku Mangrove Untuk Substitusi Bahan Bakar Gasoline
Get PDFDependence on fossil fuels requires a solution through alternative fuels. Ethanol is the recommended solution because it is easy to produce using raw materials that are abundant in nature, such as mangrove fruit. The Rhizophora Mucronata type of mangrove fruit contains 45.22% carbohydrates and is not used as raw material for human food. The research aims to produce ethanol biofuel from mangrove raw materials using multistage distillation. Experimental methods were applied at the stages of mangrove flour production, mangrove flour property testing, saccharification and fermentation, mangrove ethanol distillation, and analysis of potential performance and exhaust emissions. The research produced mangrove biofuel with an alcohol content of 28% which was produced from mangrove flour and had an ash content of 1.91%, protein, 2.24%, fat 0.53%, and water 11.61%. In addition, mangrove biofuel has higher viscosity and density properties than Gasoline at 0.8067Cp and 0.8115 g per mL respectively. The use of mangrove biofuel as a result of experiments is predicted to reduce fuel injection performance
Optimalisasi Output Photovoltaic Menggunakan Pendingin Air Pada Pembangkit Listrik Tenaga Surya Terapung
Get PDFLand requirements are one of the obstacles to developing solar power plants . One solution is to utilize the surface of the reservoir for the construction of floating solar power plants. Excessive heat from sunlight received by photovolataics reduces the effectiveness of floating solar power plants output. Excessive heat in photovoltaics can be reduced by cooling methods. In this research, a photovoltaic cooling system using water was developed. A water pump is installed to channel reservoir water to the photovoltaic surface. The cooling system uses two methods, namely the sensor and timer method. In the sensor method, a sensor is installed on the solar power plants to detect the photovoltaic surface temperature. If the temperature detected by the sensor exceeds the photovoltaic effectiveness limit, the water pump is started. In the timer method, the pump is run based on a preset time. Based on the test results, the cooling system is able to increase the photovoltaic voltage output. The average value of the timer mode cooled photovoltaic voltage is 3.79% higher compared to the photovoltaic voltage without cooling and the average value of the sensor mode cooled photovoltaic voltage is 1.02% higher than the photovoltaic voltage without cooling
Pemanfatan Lahan Untuk Budidaya Hortikultura Melalui Pemberdayaan KWT Kecubung Batu Di Desa Blawong 1
No full textEmpty land is often found in the community environment without being used for productive activities, such as in Blawong Village 1. This community service aims to foster awareness and independence of the Women Farmers Group (KWT) in land utilization through horticultural cultivation activities. The method of community service activities is carried out by empowering KWT "Kecubung Batu" through the PRA (Participatory Rural Appraisal) method, namely by involving each member in the active role of the activity. The form of community service activities is in the form of counseling and training in horticultural cultivation by making demonstration plots (demonstration plots) on empty land. Based on data that has been collected through field observations (observations) and interviews by providing questionnaires, the results obtained that almost 100% of community service activities have succeeded in increasing insight and skills for KWT Kecubung Batu in horticultural cultivation. In addition, the increase in insight and skills of KWT "Kecubung Batu" in utilizing the land for horticultural cultivation has also almost reached 100%. This is indicated by the results of community service activities, KWT “Kecubung Batu†has a productive garden as a means of empowering its members with horticultural cultivation
Pengaruh Kontaminasi Asap Kendaraan Terhadap Tegangan Flashover Isolator Porselen Menggunakan Metode Slow Rate of Rise Test
No full textIsolator berperan penting dalam menjaga kestabilan dan keandalan sistem jaringan listrik. Pada kondisi lapangan kontaminasi polutan seperti asap kendaraan pada permukaan isolator dapat mengurangi kekuatan dielektrik dan meningkatkan resiko terjadinya flashover pada isolator, terlebih kondisi basah memperburuk kondisi ini. Karena itu, penelitian ini dilakukan untuk menganalisis pengaruh kontaminasi dan variasi massa polutan asap kendaraan terhadap tegangan flashover isolator. Isolator yang digunakan adalah isolator porselen jenis pasak, dengan polutan berupa jelaga asap kendaraan yang diambil dari knalpot sepeda motor dan variasi massa polutan yang diuji adalah 1, 2, 3, 5, 7, dan 9 g. Proses kontaminasi isolator oleh polutan menggunakan standar IEC 60815-1, dilakukan dengan cara mencampurkan polutan dan 50 ml air aquades lalu mengoleskannya pada permukaan isolator secara merata menggunakan kuas. Pengujian tegangan flashover dilakukan pada kondisi isolator basah dan kering menggunakan tegangan tinggi AC melalui metode Slow Rate of Rise Test. Isolator porselen bersih memiliki tegangan flashover 79,49 kV kondisi kering dan 58,84 kV kondisi basah, setelah dikontaminasi tegangan flashover menurun seiring dengan penambahan massa ploutan hingga mencapai 48,69 kV kondisi kering dan 28,54 kV kondisi basah pada massa polutan 9 g. Penelitian ini juga mengukur NSDD (Non-Soluble Deposit Density) untuk mengetahui tingkat deposit polutan pada isolator. Nilai NSDD meningkat seiring dengan penambahan massa polutan, mulai dari 0,6 mg/cm² untuk 1 g polutan hingga 5,53 mg/cm² untuk 9 g, yang berkontribusi pada penurunan tegangan flashover dan performa isolator porselen
Pemanfaatan Limbah Kulit Pisang dan Kulit Nanas sebagai Bahan Baku Pembuatan Pupuk Organic Cair (POC): Utilization of Waste Banana Peel and Pineapple Peel as Raw Material for Making Liquid Organic Fertilizer (POC)
Get PDFOrganic fertilizers are defined as fertilizers derived from plants or animals that have gone through an engineering process to improve soil biological, physical, and chemical properties. Organic fertilizers in this study were made from basic ingredients in the form of waste banana peels and pineapple peels. Pineapple and banana peels are often found in the form of waste from food and beverage processing facilities that are collected and not used. Therefore, in this study we made liquid organic fertilizer (POC) from banana and pineapple peel waste. The purpose of this study was to examine the quality of liquid organic fertilizer (POC) products with parameters of pH, temperature, and C-Organic content compared with quality standards according to the Decree of the Minister of Agriculture of the Republic of Indonesia No. 261 / KPTS / SR.310 / M / 4/ 2019 concerning Minimum Technical Requirements for Organic Fertilizers, Biological Fertilizers and Soil Improvements. The production of POC in this study was carried out using the anaerobic method, where the fermentation process itself was carried out for 14 days using Effective Microorganisms (EM4) as a bioactivator. The results of this study indicate that the highest temperature in POC made from banana peels was obtained during the initial fermentation time of 33 oC and the lowest temperature was obtained during the 3-day fermentation time of 25 oC, while in POC made from pineapple peel, the highest temperature was obtained during the initial fermentation time. of 33.5 oC and the lowest temperature was obtained during the 9-day fermentation time of 26 oC. The initial pH value for POC made from banana peels is 5 and the final pH is 4. While for POC pineapple peel, the initial pH value is 3 and the final pH is 4. For the C-Organic content in the initial POC peel the results are 0.095% and final C-Organic content of 0.021%. Meanwhile, the initial C-Organic content in the POC of pineapple peel was 0.037% and the final C-Organic content was 0.013%. The final value of the pH parameter is in accordance with the quality standard, which is 4-9 for pH, while the final value of the C-Organic parameter is not in accordance with the quality standard where the C-Organic content according to the quality standard is a minimum of 10%
Studi Kelaikan Tower BTS Berdasarkan Sudut Kemiringan, Kekencangan Baut, Kekuatan Beton Serta Pengukuran Ground
Get PDFTelecommunication Network Tower is a tower made of a series of iron profiles or rectangular or rectangular pipes, or rectangular long pipes intended to accommodate antennas and radio transmitters and receivers of telecommunications and information waves. In principle, BTS towers have the function of connecting network user communication devices to other networks. To support the smooth operation of the network, the building will remain solid and secure for a certain period. Investigation of the feasibility condition of the tower structure is very important to determine the overall condition of the tower structure. The methods used are hammer test, check bolt tightness (torque), measure slope (vertical), grounding, and visual observation. From the results of the test data obtained the average bolt tightness is 432.86 Nm. The tower slope test of 1.90 cm on leg A smaller than 3.6 cm is considered good because it is still within the tolerance limit of the bat slope, the average soil resistance measure smaller than1 ohm used is very good, and the visual physical conditions are very similar, so it can be done Tower in safe and working conditio
Analisis Pengaruh Variasi Suhu Tempering Pada Sifat Mekanik Baja ASTM A36 Setelah Pengelasan SMAW Menggunakan Elektroda E 7016
Get PDFASTM A36 is a type of structural metal that can be applied for various purposes such as making gears, bridge structures and ship buildings. After welding, ASTM A36 steel will produce residual stress. Residual stress in the welded metal is caused not balanced temperature distribution. The method for eliminating residual stress is tempering. Tempering is used to reduce residual stresses, increase the ductility and toughness of metals. This research aims to analyze the effect of variations in tempering temperature on the mechanical properties of ASTM A36 steel after SMAW welding using E7016 electrodes. The tensile strength test on the specimen showed the highest increase due to the tempering effect of 537,880 MPa at a temperature of 200°C. This is proven by the reduction in material hardness of 165.07 VHN at a tempering temperature of 200°C when compared to the hardness of the raw material. The growth of ferrite grains in the material structure shows that the ASTM A36 material is increasingly ductile after tempering. The results of research on the effect of variations in tempering temperature on the mechanical properties of ASTM A36 can be used as an alternative way to increase ductility after the welding proces
Uji Eksperimental Efisiensi Panas Alat Pengering Surya dengan Menambahkan Batu Koral Sebagai Material Sensible Heat Storage
Get PDFRenewable energy sources originating from solar are the most environmentally friendly energy because they do not cause any pollution. The utilization of solar energy can be in the form of a direct passive solar dryer for preserving agricultural and fishery products. Solar energy has limitations related to intermittent solar irradiation, so it is necessary to add Sensible Heat Storage (SHS) material to increase thermal efficiency. Pebble stones are an SHS material that is abundantly available in a variety of colors, and suitable for solar dryers with low-temperature requirements. The study aimed to find temperature conditions and thermal efficiency through experimental tests three times, twice with SHS material, respectively white and black pebble stones, and once without SHS material. The experimental test results found that the temperature of the drying chamber was more stable with the addition of SHS material, and the highest thermal efficiency was obtained from black pebble stones, namely 49%, and white pebble stones, 40%.
Sumber energi terbarukan yang berasal dari surya merupakan sumber energi paling ramah lingkungan, tidak menimbulkan polusi apapun. Pemanfaatan energi surya dapat berupa alat pengering surya langsung pasif untuk pengawetan hasil pertanian dan perikanan. Energi surya memiliki keterbatasan yaitu intensitas radiasi surya yang selalu berubah, sehingga perlu menambahkan material Sensible heat storage (SHS) untuk meningkatkan efisiensi panas. Batu koral adalah material SHS yang ketersediaannya berlimpah dengan warna yang bervariasi, cocok untuk alat pengering surya dengan kebutuhan temperatur rendah. Penelitian ditujukan untuk mengetahui kondisi temperatur dan efisiensi panas melalui uji eksperimental sebanyak 3 kali, terdiri dari 2 kali dengan material SHS, masing-masing adalah batu koral putih dan koral hitam, dan 1 kali tanpa material SHS. Hasil uji eksperimen menemukan bahwa temperatur ruang pengering lebih stabil dengan penambahan material SHS, dan efisiensi panas tertinggi diperoleh dari batu koral hitam yaitu adalah 49% dan batu koral putih sebesar 40%